1. Freakish: While inside a bag of holding with several party members, one of them was wondering about how safe it was to be moving around.  Freakish's character goes "Sure it's safe!  Watch this!" And drops an arrow, destroying the bag, and sending them into the Astral Plane

2. Bobby : While low on hit points, spells, etc, the group stumbles across a creature that appears to be a beholder.  It slowly moves, not engaging in long range attacks, clue number 1 that something's amiss.  When it's about 10 feet away, Bobby throws a dagger at it, causing the one hit point spore to explode, killing the party.

3. Robert : When the party encounters a mysterious woman wearing a veil in a dungeon, without even asking why she wears a veil, Robert grabs it from her face, thus revealing her as a medusa.  A friendly medusa, but a medusa nonetheless.  Luckily, only a few party members looked, one of which was Robert.  I had to remind the party they were good aligned several times before they finally paid to cure Robert

4. Colby : While fighting a creature that was underwater, Colby decided the proper spell for his mage to cast was... Shocking Grasp.  Then, for his attack, he rolled a critical miss.  So, after he leapt at the monster, and missed, he landed in the water, hands first.  The spell went off.  Three members of the party died.

5. Mike : He plays a thief.  For some reason, he got angry at his guild, so he went to the Captain of the Town Guard.  Only thing is, he hadn't figured on the level of corruption in this town, as the Captain of the Town Guard was also the Assassin Guildleader.  The Assassin and Thief guilds, while they war against each other, they are closely allied against outsiders.  So, Darien spent a lonely week in jail.

6. Ross : Though I don't play with him really, David, Jason and Mike do.. so when I played with them for one night, my character dressed like a Necromancer, he cast Detect Evil on me not Once, or Twice, but Thrice... what a doody head